New Polymeric Materials for Nonlinear Optical Applications

新的非线性光谱技术（干涉法和多色简并四波混频法），以及飞托和皮秒传统非线性和电光调制测量，被用来定义新合成的无金属和金属梯形共聚物、金属大环聚合物、噻吩聚乙烯共聚物、混合价分子（在溶液中）和聚合物，光合反应中心和相关的模式化合物，以及富勒烯。共聚物合成技术用于克服阶梯形、大环和乙烯基聚乙烯材料固有的低溶解度，延缓混合价和乙烯基聚乙烯材料的光化学降解，控制分子间相互作用，并允许在可比较的局部场条件下测量材料。通过密度矩阵方法处理电子和核动力学以及应用电磁场的细节，可以表征单一材料中光学非线性的多种机制。大光学非线性的初步实现表明，随着材料性能的进一步优化，有机、无机和混合价聚合物器件的应用可能是可行的。非线性光学材料的研究结合了光学非线性的合成、最新的表征和测量以及机理的研究。该基金由聚合物和固态化学和聚合物项目的固态化学组成部分共同支持。

New nonlinear spectroscopic techniques (interferometric and multi- color degenerate four wave mixing), together with femto and pico second conventional nonlinear and electro-optic modulation measurements, with be used to define mechanisms of optical nonlinearity in newly synthesized metal free and metallated ladder copolymers, metallated macrocyclic polymers, thienylpolyene copolymers, mixed valence molecules (in solution) and polymers, the photosynthetic reaction center and related model compounds, and in fullerenes. Copolymer synthesis techniques are used to overcome intrinsically poor solubility of ladder, macrocyclic, and thienylpolyene materials, to retard photochemical degradation of mixed valence and thienylpolyene materials, to control intermolecular interactions and to permit measurement of materials under comparable local field conditions. Treatment of electronic and nuclear dynamics as well as the details of the applied electromagnetic fields by density matrix methods permits characterization of multiple mechanisms of optical nonlinearity in a single material. Preliminary realization of large optical nonlinearities suggest that, with further optimization of material properties device application of organic, inorganic and mixed valence polymers, may be practical. This research on nonlinear optical materials combines synthesis, state-of-the-art characterization and measurements, and study of the mechanisms of optical nonlinearity. The grant is supported jointly by the Polymers and the Solid State Chemistry components of the Solid State Chemistry and Polymers Program.